The U.S. Secret Service has begun the process of ordering up a new presidential limousine – but it will be a lot more complicated than simply checking out what’s available in Washington, D.C. showrooms.

And while the White House has been pressing automakers to expand their “green” offerings with new hybrids, plug-ins, battery-cars and even hydrogen-fueled vehicles, it’s almost certain that the next presidential limo will stick to tried-and-true gasoline power when it rolls up to the White House in time for the next Commender-in-Chief’s inauguration in January 2017.

It will replace President Obama’s set of wheels — a behemoth estimated to weigh as much as 15,000 pounds and known alternately as Cadillac One or The Beast. But it will carry over or enhance many of the critical features found on the car currently parked in the White House garage, with an emphasis on safety, security and constant communications.

VW hopes to make it impossible to accidentally fill a TDI with gas instead of diesel.

It’s the sort of problem that can plague anyone – even President Barack Obama, whose limousine broke down during a visit to Israel earlier this year.

It turned out that someone inadvertently filled up the tank of the armored Cadillac sedan – nicknamed “The Beast” – with diesel instead of gasoline. The two fuels don’t mix and that simply mistake can prove a costly one.

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The problem occurs frequently and all over the world. A recent study found that British police run up nearly $2 million in repair bills each year pumping the wrong fuel into their cruisers.

As if things in London weren’t already in an uproar over the News of the World hacking scandal, which threatens to embroil senior government leaders, police officials, as well as the Murdoch-owned media. Now comes word the London bobbies are chasing American President Barack Obama.

Seems the commander-in-chief blithely let his security team drive all over London, during his recent visit, without coughing up the $16 daily “congestion charge” that the British capital has enacted in an effort to eliminate its endemic traffic congestion.

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Never mind that he was there on official state business – and at the invitation of British leaders that included Prime Minister David Cameron. A fee is a fee, according to London’s Mayor Boris Johnson, who apparently used some of his brief time with Obama to remind him that he had to pay up.